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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'fbc8c26cdcfc88fde9b523ab5a801a2f67de3745575f938dad43624b91b87bf0' 
  AND token = 'zGrxnuBsTp1ss8iEiLQ+OTOdUlkk+vfX9AR+Szl9NF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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