Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3261c4fa6a0b906b504e906eba3f401c8276f6d58069552a5c0c9b558a6f901' 
  AND token = 'gMwtX+jCXWD8eYDGmZyxk8UCxxYuZ6q8Pgm+KMaw0D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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