Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90cfebcdd6812a6d7f542c025e0f355b210e03b8259c83069369eb68e6f06987' 
  AND token = 'ePRo7RS+LPZt/RXIKHfwXZ7+txQ2dJangOk+xkvXDfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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