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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e7855cb0a47003f7bd7b0ee2275f8d07b2c5015fecab7e89e56c0e42062a0e25' 
  AND token = 'tkIRtOLfmuB4bhvu5M9b2rLPaIReF/E6o0KB8/vLews=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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