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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'b7184f040235acdc3d882d1ad084c11ec1396c88ee9b42f08147e8015b7c765e' 
  AND token = 'UqtJT22oLzq3KaKflGMGDuENQnULHcC0qAbWVHr3SuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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