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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '17090217033d5bc398ba0ec7cec1a4b893e9f2ac4fe9cf9e309f9a640bb46288' 
  AND token = 'msN/qF++Hf0NWC6q7Prp/lDTlVZ68C8xgo6/+3frUMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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