Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e0ef5541989fe6d978032f7cf4ba372109ff7a498a6288e2e3c3c0b53f1d7e' 
  AND token = 'RnRWUkncBLPzDDjuE3ZIdBEyv+U2VitzfL4pWRLWfUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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