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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ad4b22456cee9b3dd67ea838c220b55b5f337a47d407676edd2dca2cbdc348ab' 
  AND token = 'sR835dILIaxCtWBvpt9yr/SdfOejVRIlg0+VD4P2mhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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