SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '60ed06bd159407dd2a46bd272c1b4d97e81367ef858ec192890f1dac72435190' 
  AND token = 'iYwO5ZUmtVl3rMucwr3bD6hnDYAYLIimgwxmCFMsdRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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