Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '743e04fb2e058a21f300527fd8c12fd86d8ecaa64256b8046a0ca36fdf5d706f' 
  AND token = 'CDkCETRyTjFJ2EyD0CfnIgAjlKYs+gKDoCpgGXYwCAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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