Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f0440f97eacdaabd0c95467d74e6175b037e17443c4068bed4448b6da9681cf' 
  AND token = 'l7sEYKXwOqWq/MAHwpCGZ1dvv6PMyS7wgYG8TWi8Yfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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