Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c078abf86eee8a546be3973039732d995b3f577f0914389900efe19da1a13415' 
  AND token = 'WMVlQ+TbjMTxUcXvw2kSmv6gc9gyETI23IJ4H8Pogqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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