Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2594eb0ef83c4dfdb4cb605c5f3169adcdfff0167551df27850ccc54906ad2a' 
  AND token = 't5JZJEKlrHvRy2oDTtZW+s9DF3vdNmh2XcVvBK0Tk0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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