Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc3271c25db52a35b7c7b93fae2a1738a3beaa0248ed25e5f6ff9056224eef75' 
  AND token = 'N6etCgpTQKbdrW5QMDtswCIpLIecKjNeJ3AzeHInSqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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