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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '11f1c89e6dc1f96adceda98355f017f39e43ea9b851e6bf3e9579b64bca45584' 
  AND token = 'hNOq3AN4k/Hxvm9NuiUVy1bgZormfRkqdFirPUirM80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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