Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a798ca5ddaf8543daba61b0fd296bd4fddb8c0dd7f7486271240d12c8479a6d' 
  AND token = 'vkU7qucs08xf2Q2JaEaUsYBI4M2Crdy7r8XjLrIbmbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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