Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e942b7d1466f35c431d8fddf680a0477f85fa9147eedbb44ec597c35f86aa1b8' 
  AND token = '6Ku6w1M7sL1Wg9wTj5bpPO2muZ5wYkl6AvyRUjb2ulM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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