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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '1fd330f59a4e8bf40af7c394af647dc44548ca269e503efe1d648aca17c75a9a' 
  AND token = '7tI1nxhywoxolhjKa+ewBBx+o9f/OEO97U8Gn/wtYLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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