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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '5b90ac8dea3887376fbf0937c4bc96ae03195982a8b974e96b9250ac345c0c7a' 
  AND token = 'YtvikBM5X62pIJ6x0UAnxrhI7I7grMBn+ZMDo5F8TBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}