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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '58c8fc39cbc19376088a0a44eaf42e3d86d1b83c64ad100cb1097ebbba970782' 
  AND token = 'zretFat+mGY/GQRaOExHUpRtoLcL5r3JOfJEFTi31wQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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