Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbeb8a1eb9b8aa6990d3c340bf99ea01042ea9e8865226fd21b305f9c92f9be3' 
  AND token = 'gSxJgUuKFh0CCKnwjk3+EkuLc69Y/a/RcLAwEcyAjQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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