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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8ba0a83db5c6b57e0fab310bfca2407c1162b0c64a3b8ce2788f813123c54a3e' 
  AND token = 'pIjwl02ecvt7801Toj62+yj0HbwvCMATfzLvXrPRFhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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