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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c1730babe4197b800b6a2eb6d2387eee7b76af8cc7025bbf84ff6798d3981858' 
  AND token = 'jfsdIJoiK8KPUw1mFg0zzfupV3UG1bhs1gil1vlK8Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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