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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '22da68820f5cb217c4fc193d0fe01128f468ce5f900c282cd2f9cc9e0cbf86be' 
  AND token = 'MB8c/F5K33zUCLrtQvCXX99d0yjCAOtBsvcQgCuUV+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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