Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a833129897ff2bee9b722444d03767a72b222655a1d1259f720fb289af692e0' 
  AND token = 'kT/htQlaFMV/NBnjTm/AbcWVRj2S2H2WAOHX0ibQjio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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