SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0cd57ea660a673d614ec19b34e0953c49d572579cb261c0ea7fe10e7d8b1ab49' 
  AND token = '1gqavw2Ji39LtDZgWPfCBmrrM+HsuyuP2K2dFEl5l6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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