Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803ec08553e09ea7df19f620d86dc45f7bf90f3628c9bc8558c58fe98246cb1d' 
  AND token = '9gU2nKS5CtXUx4561HyNPvgI/iLI7z7AWfnimPrBBY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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