Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b9e10dea45e768b5cef6f4248db9f00a3dcaf0f392f9a54711849f46fccfbb' 
  AND token = '5drGW6YouhlRT9RU61zALKyYjjbTj6XqNMZD6DG0x88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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