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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '74c5513aaa1bd69889935abe681b4bb99535e6363cb2c0bfee6550d08ed5ea65' 
  AND token = 'Ie8GuZcw25NQLfwyS6sbBDP14WXN4X8HxGeYK59fw1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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