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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '30daa81dcc980b718fd5f50ae69b2bff2a3ab4dda70fb46ada30637cbfea3117' 
  AND token = 'SvmnfZ0ageM3aM4O1yu2CKuKPLLHpPNLbnjREX53RcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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