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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1b40bd26e5874f98e736f7f948a8a844965ae5b389e2bcc915e723ef40194f3d' 
  AND token = 'k29dX6zylwuAPyqRY1tVXuXi2G9yBHF15OUqHhMYfSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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