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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '09020f3882b081d5bb07c22a1197d2f5a0d6d46c974718d868e94f27fb8eeb28' 
  AND token = 'OV3WMnQJf2PsBL94A0ZvV/U7nx8EnaJRUuQDDAodk+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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