SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'faf2b97e950585976b2892851a198f83298e08ffd8363bec86822020aac7c6aa' 
  AND token = 'CDBcZXG8TfTDL5oXS+jhmD5b8z4vWqKQF2YH+LhV+d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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