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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'baadbc487b0545de81bad6cbba574cdf8309e0e59d27c22103aff1edce825e88' 
  AND token = '2B7sU2V4iItgHSFUOakZTqqJuc0DdNHlfY+oPr8r7qw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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