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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a386b7782feecbda9005c894cb249fdc803bac54f9ee9b6378bbdc8374050145' 
  AND token = 'd4W097gVrHJ1UKdBVzSlH4d641TW3+A0IRi5OnejKJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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