SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bc9a987c379e1753ce200a0e934b80a8f60e9888d89956def07453d26ed8fd4b' 
  AND token = 'kzRIxhpDwIFwJsEggmyszr5Rq/xO/H7ZeWHT4Xb1I+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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