SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b15610803c378718b94ddda961c28cccdd272856ceb9bcfb2a67ede4a75638f9' 
  AND token = 'Lzrl9467/bZffXWxfwFhaWtgJwYd0SaWtU5Cw6B16Tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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