Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe880de4d86d1d8c4482f2cbe8409f6b2316fcd811eeadfa8bfe03938885a18c' 
  AND token = '2OWO3O2Fm/wyOp0ji7hvA/Qw7DsAP9zV4BEnA8Ax/28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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