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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '679b5025dc6b60018e84aefdd17dbd3770009def9430172e4c6a63b6f43b887d' 
  AND token = 'dXlxfigUSwq8JSn3GQYK2XfMh2aDxWYTAtFk0mAb6Dc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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