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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '034dce955828cadaa1d1acef9ba56d9a4cdd083003856f73d319d529c29d1f97' 
  AND token = 'fQ7gt/g1t5Hbv0FyxBaxRvOGo0rJh2WR+TIJzXVWt1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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