Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b647776ebe38a2ce731f4f5d8c7ee28c8fc87dd89b1061834e10939500bf7e8d' 
  AND token = '7XzHXCUHchETbCFQU7eWJSduSeLCCkXq2rDRDaB5ceo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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