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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'fec0dd68384f10468d0fe6cb6daf4bba650fa42c049348c423fa05ca532e882e' 
  AND token = '8A+mlIBxm8Mdh4GjHKc/9iTBBKy6wVVax5d1UZPteHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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