Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4342a2268394fd20d04330f0adca7c893306955b78fa824c563d8917ecacd02d' 
  AND token = 'ZI8KctiL4EqVcdRIqF4kYZWvRXpIAG83WRThTgPqiKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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