Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cb543bce593fa3fa60d64519c8981c90e79d1e484bdaa148cb07104b8a94525' 
  AND token = 'd7ZA3I2ppvPFzxHs9IP7ev3NYr+TF45m7U/lJ+MeGuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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