Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dc576ef474e7ba39f37e774c7309619d3e234e8f723b29f38639a365eb5a255' 
  AND token = 'VI2KzWnST/M2JEImQI/G++ke6KC99cY/Dm8DEifpVgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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