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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a55085ad777037d876eabcc19379d7b292d15c2486b9690f8fa89ba24fe0ff20' 
  AND token = 'F4nsKHsYGe66h1NkfUOBk2LfYjh4PXIOyoSuLFrh7yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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