Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a455e94e232e0312b7521a56b08afc8b86ad1019db07d9c457190615b7880203' 
  AND token = 'd8uKm+MUzgHzl8auhSl8JC0V4UayVM7nmGRPesyjfyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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