Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '715cbc4a8c2c0a84b178fa8115c3b3ca60729724d4ebc71daadf9f335019dfef' 
  AND token = 'bnmgJaXD9rKr8wLQ7avoDt2578GP4dHw0XQypJA6xig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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