Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524eb705c97c62b516ad2a910ca350e4555105964ca43af554e93390437fbc13' 
  AND token = 'sHcCG5vplUtt1pHONwEGaMJMIvPjq8iJvrN4BIhTBzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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