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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b9aa2946681a00413e9f039cfa61599b690f9f0386702298b3a53935d66289d9' 
  AND token = 'pw/zXTjT+5h3EXq5j9fkNVMO4WsQUC3VSNXp0yw+6rE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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