Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e94855d6a12de3576a1bbf2f8f0db2712e38dbf714c15e521251de334fd0ee51' 
  AND token = 'akWyHyrTrDcrgRjIRGNfUOI8zAqVbeAergLQqja1MXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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