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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4dd61d0e997e06076f4a7cb0957e02aa5e6aaffabc23ad780458d04e63a8f065' 
  AND token = '5tuWnpK0rDTnj9VJiy270mgc3W0Drx1ZJVW0bBT7+jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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