Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda20fee9b0e86efbec5c46dea44f89c160b6b69a89679413ffde1bc688f05e4' 
  AND token = 'QJ+xGeLJ9+97Bcg8/Ad2ijj2Jd4UIH+fitiXRJAExvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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