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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'd9f27a6ef029daf1c4c2ec8b957adb2a71dc322145b9d857d7f97aff81222fc9' 
  AND token = '3bWFKrdoKY6bqhtYY4hiRTihUcCWQPRGRMHp3k5mM2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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