Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0acd47b8ffb5b6eed90b686e4678d14826084a58507129bb0081728fff0352d' 
  AND token = 'QCVQFYYDldKyeI7/sD6vOUQsTZYLA1O7mi4zSJ/Y6Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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