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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c5d8aa98a1abab89fc42bb5ab17e4cf10001910cb7f5f181d8d09a7d5f633040' 
  AND token = '4VNHuktaa7I6qC2nhdxqPTiRK4qJEsubWQ9p5QCDTO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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