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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '642b3bd4e52b73b7333b0e2f91b1a9bf1014b86d3dff933bda439390f76726cc' 
  AND token = 'LkYz/Vt8lnfkV75DcPpyNkPCeHX5xTVEzkXDK8Fdtic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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