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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '37025daaec4cb1bef10ad019c83fa6a44b66dae06c791526c7d91e7a36ca13a8' 
  AND token = '/WbGEUvLpx/GdErNfovHWNAPXPPjx+Tnk487Oo0sSXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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