SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'f3d79db189bba77bf8b76bc902c7eeeb0c531f1736b6b96510ae1d94d949561a' 
  AND token = '6YGU1wlZAvNk+ykNoYvqIENOEvu22injCmexFXKwmVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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