Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1dc2f40cf8e6ad7ef0ed855c0d2d05ff2bac652b656a50d5fe115eeef5c2703' 
  AND token = 'WvC+9l2Hi92l1uQxFCaNjpJjLn/kHFHn3s6YTY86m04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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