Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d578b442ba421a452ee46d7e4438262a16b1b4aa0a236322e3c64aa492f155b' 
  AND token = 'zaNdtJlYVhj2UQ4peGc/xbnc0AteanTb3+sTn8SaqlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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