Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c8002eee97adab5ea8f670d60d4c18766b7437d12753168eee7e6c1ddef9ac3' 
  AND token = '+UtB9OtiFh/l7537y/179UKL2yalOwkUCYweNJz/EuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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