Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a78f2d801678504cc7939f7c7108b79a7d5ef2883a018fd007cda8573f541641' 
  AND token = 'zKvCn6oQL4FoZytOIKaRa+LtvH1kkUvSr3TgzyEd0JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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