Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f59f652dea1a512a83443601181d0854611af1670a1307d376f44bad01b473d5' 
  AND token = 'IZJrICRWKZ6PhF4d0OUv6DMXaiI0xJERonzr+7cxOQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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