Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd86de1ed03871b707fada435d21a6d5e5ad48b81dcabb2fc7a764ca7c93fadbc' 
  AND token = 'l6C8ccSZakF7vOk0gnwWEPxEe/+3CdmmDyfUL7lHkzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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