SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4ecb652a64e380a64b4da4c816da9c144e8d3916f41fd5119629fe0e7008bcb2' 
  AND token = 'VC91LPryZvbNr/nUnL+wvDcEKu4QtRlygYAPmNzh+FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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