Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb1b10250d5740a98d915638808f14da0420d40528c264789bf25aee7488eb6' 
  AND token = 'A/fcypFjLQIk+SblGq+ezh1w2W4mBOQ68BEoRl0VOdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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