Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10e997a91ffc89e0e3db6efbc92deb5c378b038c073a87e77fa4748714a4a0a8' 
  AND token = '9XdQc++Zm33ukxVSNR+fWiH/wnOAdUaodDqddsvIK0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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