Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b89c4f2b8c615e3a745b4ab840193e33acbe5df787b8df83d2ceecabc185037' 
  AND token = '7GpsJnt9sJEx7BKiCAqiodDAHsxNW3ljL1mQ73Ptv3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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