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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '57d97a5c02cabaf4f588adf4b7c5b0be8e72c2964be0e8d6b7d6f003d156cf02' 
  AND token = 'ziMMz1CBXgH+GJfWpGtqpvQlg0Ne8blngIvASlsitTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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