Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f8c82d80441cea537c159f1bb2c0647eaef27d52c48f742ee3078e3ab8b697' 
  AND token = 'kNOsjaXZw9QPnLD3c4KfWIYv66jd00su7x4lxHl0Ew4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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