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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ff7bb169a208c0d251beb44d5f5f2d282804d3eb8febdea14c25170544b41746' 
  AND token = 'WE23TX2K1e9+KIsBQ3dh/DfVazqnYM8M0DiynDQXeO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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