SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9b0b896db09d11fa146b7e63bd66e129235f725278083540daf5f6fe0eeae79f' 
  AND token = 'm49v5Yz7Dn6T6tZSn+5IvcoH9jiZiGFLs0K+3rS8YKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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