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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '2f768354bb0393fcc140d94ab500c63c7b36775e18b2a156c3bcb4b45b8d2e67' 
  AND token = '/EiR3ZjghieVs8xd99VnEAY9ZDdc8mdla000tCxYGhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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